Shareholders' Equity Rollforward (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended						6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013 Preferred stock	Dec. 31, 2012 Preferred stock	Jun. 30, 2013 Common stock 2	Jun. 30, 2012 Common stock 2	Jun. 30, 2013 Paid-in capital 2	Jun. 30, 2012 Paid-in capital 2	Jun. 30, 2013 Retained earnings		Jun. 30, 2012 Retained earnings		Jun. 30, 2013 Deferred compensation obligation	Jun. 30, 2012 Deferred compensation obligation	Jun. 30, 2013 Accumulated other comprehensive loss 3		Jun. 30, 2012 Accumulated other comprehensive loss 3		Jun. 30, 2013 Treasury stock	Jun. 30, 2012 Treasury stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
As of beginning balance			$ 895,116		$ 846,309		$ 1,150	$ 1,150	$ 364	$ 270	$ 849,046	$ 690,131	$ 45,790		$ 157,242		$ 3,111	$ 3,620	$ (982)	[1]	$ (1,084)	[1]	$ (3,363)	$ (3,870)
Net loss	(25,438)	(5,638)	(41,821)		(17,537)								(41,821)		(17,537)
Dividends Declared			(3,450)	[2]
Dividends Declared					(5,176)	[3]									(5,176)	[3]
All Other Changes			45,542		2,992				101	1	45,401	2,947					(448)	(588)	38	[1]	46	[1]	450	586
As of ending balance	895,387	826,588	895,387		826,588		1,150	1,150	465	271	894,447	693,078	519		134,529		2,663	3,032	(944)	[1]	(1,038)	[1]	(2,913)	(3,284)
Preferred stock dividends	$ (1,725)	$ 0	$ (3,450)		$ 0								$ (3,450)	[2]

[1] The Accumulated other comprehensive loss (“AOCL”) is entirely attributable to our defined benefit pension and postretirement health care plans. The changes in the balance of AOCL for the six months ended June 30, 2013 and 2012 represent reclassifications from AOCL to net periodic benefit expense, a component of General and administrative expenses, of $58 and $72 and are presented above net of taxes of $20 and $26.

[2] Includes dividends of $300.00 per share of 6% Convertible Perpetual Preferred Stock (the “6% Preferred Stock”).

[3] Includes dividends of $0.1125 per share of common stock.